To notice or view, especially carefully or with attention to detail.
To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning).
To comment on something; to make an observation.
To follow or obey the custom, practice, or rules (especially of a religion).
To look intently into; examine; inspect.
To see or look under or below; see below the surface of.
To neglect; fail to see properly or adequately; turn a blind eye to; ignore.